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Authorities in the US state of Connecticut are investigating a possible threat against President Obama, according to local media reports.

A statement from the US Secret Service, which oversees the President's personal security, said: "Information has been received by law enforcement regarding a potentially suspicious person and vehicle. We are working with our local law enforcement partners to determine the validity of the information provided."

The US Secret Service said it was working to establish the 'validity' of the threat to President Obama. Credit: Olivier Douliery/ABACA USA/Empics Entertainment

A local newspaper said state police were looking for a man who had allegedly made a threat against Obama.

He was believed to have been driving a car with Connecticut licence plates.

Obama was making a number of fundraising appearances in the north-east of the country on Friday.